Time Sheet Advanced Upgrade to Open Source is extremely easy and simple to use, which will keep track of your employees hours. It allows you to specify and set unpaid breaks in 5 minute intervals on a daily and employee basis. If your employees work hours that span into a new day, no problem, the time calculations will accommodate this. All Start and End times span a 24 hours period in 15 minute intervals, all you do is select a Start time and End time from a drop down list. This makes it impossible to enter times that Excel wont recognize.